On Jul 22, 2024, at 5:00 PM, Wietse Venema via Postfix-users <postfix-users@postfix.org> wrote: > > Austin Witmer via Postfix-users: >>> You will need SPF, DKIM, and DMARC with 'p=reject'. If this is >>> an interactive list, you will need to replace list member's From: >>> headers with your mailing list address to satisfy DMARC. >> >> I believe I have SPF, DKIM and DMARC setup with p=reject. >> >> So the big list with 1500 members is not an interactive list and >> probably will just have one sending (gmail) address. > > Your server is not gmail.com, so when you send BULK mail with a > From: addr...@gmail.com from a non-gmailk server, then that can > be problematic.
Would it be better in your opinion to setup a dedicated address with a domain I own, on my server, for sending emails to a non-interactive list this big so that the sending address is “allowed” to send/relay mail through my server? That way I don't have the appearance of sending email on behalf of a gmail account from my server? > >> Will DMARC be broken if I only add the following headers to mailing >> list messages? >> >> X-Mailinglist: >> List-Id: >> List-Unsubscribe: >> List-Unsubscribe-Post: > > Unlikely. Note that the rules for BULK mail are defined by the > receiver. > >> From what I was reading online, I thought "From munging" is not >> necessary if I am not modifying the subject, body or existing email >> headers. And thus the original senders DMARC won't be broken, >> right? > > That may still work with low-volume PERSONAL mail, but the rules with > BULK mail are different. Do you have any recommendations on how to accomplish this “From munging” without using something like mailman? Perhaps a milter of some kind? > > Wietse > _______________________________________________ > Postfix-users mailing list -- postfix-users@postfix.org > To unsubscribe send an email to postfix-users-le...@postfix.org _______________________________________________ Postfix-users mailing list -- postfix-users@postfix.org To unsubscribe send an email to postfix-users-le...@postfix.org
